Shaping and Centering Ability, Cyclic Fatigue Resistance and Fractographic Analysis of Three Thermally Treated NiTi Endodontic Instrument Systems

Autor: Vytaute Peciuliene, Rasmute Maneliene, Saulius Drukteinis, Vilma Brukiene, Ruta Bendinskaite, Vygandas Rutkunas
Rok vydání: 2020
Předmět:
Molar
medicine.medical_specialty
Cyclic stress
root canal shaping
Materials science
Scanning electron microscope
Root canal
0206 medical engineering
02 engineering and technology
lcsh:Technology
Article
03 medical and health sciences
0302 clinical medicine
fractographic analysis
medicine
General Materials Science
Statistical analysis
Endodontic instrument
micro-computed tomography
lcsh:Microscopy
lcsh:QC120-168.85
Orthodontics
transportation
cyclic fatigue
nickel–titanium
rotary movement
thermal treatment
lcsh:QH201-278.5
lcsh:T
030206 dentistry
Endodontics
020601 biomedical engineering
medicine.anatomical_structure
lcsh:TA1-2040
Nickel titanium
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
lcsh:Engineering (General). Civil engineering (General)
lcsh:TK1-9971
Zdroj: Materials
Materials, Basel : MDPI, 2020, vol. 13, no. 24, art. no. 5823, p. [1-13]
Volume 13
Issue 24
Materials, Vol 13, Iss 5823, p 5823 (2020)
ISSN: 1996-1944
Popis: The better understanding of the clinically important behavioral features of new instrument systems has an important significance for the clinical endodontics. This study aimed to investigate the shaping and centering ability as well as cyclic fatigue resistance of HyFlex CM (CM), HyFlex EDM (EDM) and EdgeFile (EF) thermally treated nickel&ndash
titanium (NiTi) endodontic instrument systems. Sixty curved root canals of the mesial roots of mandibular molars were randomly assigned into three groups (n = 20) and shaped using CM, EDM and EF files up to the size 40 and taper 04 of the instruments. µ
CT scanning of the specimens before and after preparation was performed and the morphometric 2D and 3D parameters were evaluated in the apical, middle and coronal thirds of root canals. In each group, 40.04 instruments (n = 20) were subjected to the cyclic fatigue resistance test in artificial root canals at 37 °
C temperature until fractures occurred, and the number of cycles to failure (NCF) was calculated. The fractographic analysis was performed using a scanning electron microscope, evaluating topographic features and surface profiles of the separated instruments. The one-way analysis of variance with post hoc Tuckey&rsquo
s test was used for statistical analysis of the data
the significance level was set at 5%. All systems prepared the comparable percentage of root canal surface with the similar magnitude of canal transportation in all root thirds (p >
0.05), but demonstrated significantly different resistance to cyclic fatigue (p <
0.05). The most resistant to fracture was EF, followed by EDM and CM. The length of the fractured fragments was not significantly different between the groups, and fractographic analysis by SEM detected the typical topographic features of separated thermally treated NiTi instrument surfaces.
Databáze: OpenAIRE
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